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Superplasticity‐like Deformation of Nanocrystalline Monoclinic Zirconia at Elevated Temperatures
Author(s) -
Yoshida Michiyuki,
Shinoda Yutaka,
Akatsu Takashi,
Wakai Fumihiro
Publication year - 2004
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2004.01122.x
Subject(s) - nanocrystalline material , materials science , superplasticity , tetragonal crystal system , monoclinic crystal system , cubic zirconia , deformation (meteorology) , strain rate , deformation mechanism , metallurgy , grain size , composite material , crystallography , alloy , microstructure , crystal structure , nanotechnology , ceramic , chemistry
The deformation behavior of nanocrystalline monoclinic ZrO 2 polycrystals (nanocrystalline MZP) was studied at 1273–1373 K in compression tests. The deformation of nanocrystalline MZP was characterized by stress exponent ( n = 2.5), grain‐size exponent ( p = 2.5), and apparent activation energy ( Q = 350 kJ/mol). The values of n and p were similar to the superplasticity of high‐purity Zn‐22% aluminum alloy. The strain rate of nanocrystalline MZP was faster than that of Y 2 O 3 ‐stabilized tetragonal ZrO 2 (Y‐TZP) at temperatures lower than the monoclinic‐tetragonal transition temperature. The strain rate of MZP gradually approached to that of Y‐TZP as the temperature increased to the transition temperature. The comparison of present data with published data suggested that trace amount of impurities affected the deformation behavior of MZP.